When 90-year-old Grace looked at her old wedding pictures, she was flooded with vivid memories of her husband and the early years of her marriage. The pictures served as powerful encoding devices
iconic memories
memory devices
automatic processing devices
retrieval cues

Retrieval cues

explanation: the term retrieval cues are referred to as a stimuli that helps in memory retrieval, it helps a person to access long-term memories by bringing them into the persons conscious awareness and also makes it easy for a person to recall a piece of memory in an easier way. While making a new memory, a person not only makes the memory of the thing but also grasps information about the situation at that point in time bevause it acts as a trigger to remember the memory again, with the help of retrieval cues.